RAF Azure Blue vs Fenrisian Grey

How close are they?

ΔE 8.8, close: similar, with a visible difference side by side. Fenrisian Grey is more muted than RAF Azure Blue.

Can I use Fenrisian Grey instead of RAF Azure Blue?

Usually, if you are not matching paint already on the model. Close match (ΔE 9). Fenrisian Grey is more muted than RAF Azure Blue.

Can I use RAF Azure Blue instead of Fenrisian Grey?

The same difference applies the other way round: RAF Azure Blue is more saturated.

ΔE is the colour difference between our two swatch estimates: under about 6 is close, over about 15 is loose. Real paints also differ in finish, coverage and how they thin, so test before you commit.